Our company performed installation and commissioning of high-frequency protection posts on 110 kV transmission line “Chernihiv heat electropower station – substation ”Tyagova Chernihiv“ on the substation “Chernihiv heat electropower station” and substation ”Tyagova Chernihiv“.Our company implemented modernization of protection panels DFZ-201 type. There were also substituted transceivers of UPZ-70 type for high-frequency protection posts.Our specialists performed works in installation and commissioning of transceivers of high-frequency protection posts on substation “Chernihiv heat electropower station” and on substation ”Tyagova Chernihiv“. Our company realized complex check of DFZ-201 protectors after reconstruction of high-frequency equipment.